export declare function useEChartsThemes(): {
    theme: import("vue").Ref<string, string>;
    setTheme: (t: string) => void;
    loadTheme: (ts: []) => void;
    getAllThemes: () => string[];
    checkTheme: (t: string) => boolean;
    registerTheme: (name: any, themeJSON: any) => any;
};